根据生产安全事故造成的人员伤亡或者直接经济损失，事故一般分为特别重大事故、重大事故、较大事故和一般事故。

A、正确
B、错误

A．it challenges IoT data
B．it can shepherd through pre-determined processes to arrive at outcomes
C．it can learn from interactions with users and experiences with the environment
D．it can program systems explicitly